Boo (ブー Bū) is a ghost that appears in several haunted stages of Sonic Adventure 2. They come in two types: a normal one and an attack one.
The former resembles a smaller version of Boom Boo. It only has one attack, which is to scare a character momentarily (in which they look like the attack type). They are found standing still, iddling around or patrolling an area. After scaring a character it disappears, but awards no points.
The latter is bigger, with large and colourful eyes and mouth. It has two attacks: holding a character in place, running into the character, this one taking damage. It sometimes stands still in the middle of the air only to swoop down and quickly chase (sometimes jumping as well) a character that comes near or mills around slowly, only to chase the character quickly once it sees him or her. After being hit it disappears and awards 100 points. It should be noted that throwing objects doesn't affect ghosts.
|Knuckles||Pumpkin Hill, Aquatic Mine, Death Chamber|
|Sonic Adventure 2|